Analysis of language based on behavioral principles

Which of the following is a correct description of the analysis of language based on behavioral principles? Group of answer choices Verbal behavior is a type of vocal behavior, which requires two people. (HINT: Does verbal behavior require vocalization and two people?) Verbal behavior should produce direct benefits for the speaker for it to be maintained. (HINT: Mand does produce direct benefits for the speaker, but do tact and intraverbal produce direct benefits for the speaker?) All are correct. Verbal behavior is evoked and maintained by environmental variables. (HINT: Is verbal behavior analyzed in the same way as nonverbal behavior?)